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Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... was thinking of doing a fast version holding the attribute value ... string
[B]- How fast is it?[/B]
;
push de ;save char cell top ... /> ld (de),a
pop de ;get top of char ... -
Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... fast.
*though isn't it faster just to push and pop ... br />
pop bc ;pop graphics into c and b ... inc h
pop bc
ld (hl),c ... inc h
pop bc
ld ( ... inc h
pop bc
ld ( ... -
SUPER INPUTA couple days ago I searched for an "INPUT string" routine that I could use in Assembly programs and supported multiple lines, but I found none. Thus…
... br /> [CODE]EDIT: push hl
push bc
ld a ... SET_WORK (reset workspace)
pop bc
push bc
inc bc ... jr z,NOTEXT
ldir ;copy initial string to INPUT workspace ... -
Machine Code Routine of the weekHow about a thread that has a routine each week that is in [B]assembly language[/B] and is also described in great detail what the hell is going on …
... I do do similar for fast simultaneous keypress detection.
pop af
pop ix
pop de
pop hl
pop bc
push ... -
Multiply the value of 'a' by 5Is there a way of multiplying the value of 'a' by 5? I've tried 'add a,a' etc. but only get multiples of 2...
... ;639573]Anyway, I guess PUSH HL, POP DE is our best option ... as opposed to 21T for PUSH HL : POP DE . I'll generally ... immediate 16-bit register copy, and PUSH rr : ... : POP rr for a delayed ... copy or a "save until later ... -
64x48 full colour graphicsHow feasible is this? Could an interrupt-driven routine be used to, for example, fill the top two thirds with a 64x32 blocky picture and leave the bo…
... from left-to-right, to copy up a line in segments ... far, which is to POP HL from the source data ... changing SP and doing a PUSH. You can also use ... by using LD instead of POP to fetch the data from ... problem is the fastest operations (PUSH) fill right-to-left when ... -
Play command on divideHi, i thought I'd have a quick go on divide seeing as i had an afternoon spare.However,i can't seem to get the 'play' command on the screen?. It see…
... code, but I had to copy the assembly; no problem with ... 40300
MIDIOUT PUSH DE
PUSH HL
PUSH BC
L11A3 ... NZ,L11E7
POP BC
POP HL
POP DE
RET ... -
40 Column Printing RoutineI've written a 40 column printing routine, which I'd like to share... It's my first piece of 'public' code so go easy on me! I don't think it is a…
... call overshiftscratch ;
pop hl ;
push hl ;
call ... pop bc
djnz nextshift
ret
copytoscratch ;copy ... -
copying between RAM pagesSay I'm storing stuff in RAM pages 0,1,3,4 which gets used in 6,7 (which I am) and I might want to transfer up to 7kb at a time (which I do) and I do…
You could do a copy via the registers, which requires ... fastest means. Adapting an existing POP/PUSH copy routine shouldn't be too ... -
What Spectrum projects (Software/Games/Utility)(Hardware)(Others) are you working on?So, basically that :) You dont have to give names or more clues if you dont want to ;) Also, if you are working on more than one, you can tell all of…
... anywhere.
I then POP these four patterns into registers ... and have a series of PUSH instructions to paint the blocks ... 's actually the list of PUSH instructions that describes the layout ... a list of PUSH instructions and I just copy a run of ... -
smooth movement in basicWas trying to figure this out myself but i would like to be pointed in right direction now :-). How do I make something move in Basic without gettin…
... ld hl,(23627) ;VARS
push hl
ld de,(23653 ... /> ldir ;copy by,bx,my,mx to calculator stack
pop bc ... C=sign,my
push bc
push de
call $2307 ... -
Fantasy Z80 instructions?This follows on from something catmeows said in another thread, and that I've been meaning to ask for a while. This may sound daft to people with mo…
... ,(nn) LD (nn),rr
PUSH rr POP rr
8 ... cc,nn
Block Copy/Etc
--------------
{LD,CP ... -
Optimisations in Exomizer Z80 decrunch codeThis is the 163 bytes old code (simple and optimized): [CODE] ld iy, exo_mapbasebits ld a, 128 ld b, 52 push de exo…
... done this in the fast version. Please, ... call exo_getpair
push bc
pop ix
... =origin
push ix
pop bc ;bc=lenght ... /> call exo_getbits
push hl
ld l, ... -
Optimisations in Exomizer Z80 decrunch codeThis is the 163 bytes old code (simple and optimized): [CODE] ld iy, exo_mapbasebits ld a, 128 ld b, 52 push de exo…
... ]
...you can try copy/paste the link below:
Push ix
Pop bc
Ld ... -
Compressors are available for Speccys ?Hi folks, although I was an wasn't strictly a speccy coder in the glory days (amstrad & amiga for the most part), I have secides to arse about with …
Even more speed for aPLib fast depacker, 197 bytes:
... ld iyl,c
push bc
call ap_getgamma2 ... apskip3: pop hl ;bc = len, de = offs, hl=junk
push hl ... code for length
push hl
push de
ex ... -
MEMPTR tests for emulator authorsI've recently been completing my MEMPTR implementation and have written a series of tests in [URL="http://homepage.ntlworld.com/mark.woodmass/z80test…
... :
[code]
PUSH AF+POP AF
PUSH BC+POP BC
LD ... BC,x
LD BC,x+PUSH ... BC+POP BC
EI
copy of the flags register (or ... -
Compressors are available for Speccys ?Hi folks, although I was an wasn't strictly a speccy coder in the glory days (amstrad & amiga for the most part), I have secides to arse about with …
... LD BC,00052
25009 PUSH DE
25010 LDIR
25037 DEC HL
25038 PUSH HL
25039 LD L ... /> 25055 INC DE
25056 POP HL
25057 SBC HL ... , and it is very very fast. I only miss a PC ... -
ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... :
ldi ; copy literal byte
... restore destination
push hl ; store destination< ... /> ldir
pop hl ; restore source address ... -
ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... :
ldi ; copy literal byte
... restore destination
push hl ; store destination< ... /> ldir
pop hl ; restore source address ... -
ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... :
ldi ; copy literal byte
... restore destination
push hl ; store destination< ... /> ldir
pop hl ; restore source address ... -
ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... :
ldi ; copy literal byte
... restore destination
push hl ; store destination< ... /> ldir
pop hl ; restore source address ... -
ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... :
ldi ; copy literal byte
... restore destination
push hl ; store destination< ... /> ldir
pop hl ; restore source address ... -
ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... ; DE = destination
ldir
pop hl ; restore source address (compressed ... , b
; copy previous sequence
push de ; store destination address ... -
ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... :
ldi ; copy literal byte
... restore destination
push hl ; store destination< ... /> ldir
pop hl ; restore source address ... -
ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... :
ldi ; copy literal byte
... restore destination
push hl ; store destination< ... /> ldir
pop hl ; restore source address ... -
ZX7: an "optimal" LZ77 packerAbout 20 years ago, I started a M.Sc. in Computing, planning to work on data compression. Although I quickly changed to another subject for a number …
... :
ldi ; copy literal byte
... restore destination
push hl ; store destination< ... /> ldir
pop hl ; restore source address ...
